cleanup, commenting, linting, etc.

cleanup, commenting, linting, etc.

SCCS-vsn: usr.sbin/sendmail/src/alias.c 3.19
SCCS-vsn: usr.sbin/sendmail/src/arpadate.c 3.6
SCCS-vsn: usr.sbin/sendmail/src/conf.c 3.28
SCCS-vsn: usr.sbin/sendmail/src/deliver.c 3.35
SCCS-vsn: usr.sbin/sendmail/src/collect.c 3.19
SCCS-vsn: usr.sbin/sendmail/src/err.c 3.10
SCCS-vsn: usr.sbin/sendmail/src/sendmail.h 3.37
SCCS-vsn: usr.sbin/sendmail/src/parseaddr.c 3.23
SCCS-vsn: usr.sbin/sendmail/src/savemail.c 3.17
SCCS-vsn: usr.sbin/sendmail/src/main.c 3.32
SCCS-vsn: usr.sbin/sendmail/src/readcf.c 3.13
SCCS-vsn: usr.sbin/sendmail/src/macro.c 3.4
SCCS-vsn: usr.sbin/sendmail/src/headers.c 3.6
SCCS-vsn: usr.sbin/sendmail/src/stab.c 3.8
SCCS-vsn: bin/rmail/rmail.c 3.3
SCCS-vsn: usr.sbin/sendmail/src/recipient.c 3.10
SCCS-vsn: usr.sbin/sendmail/src/stats.c 3.2
SCCS-vsn: usr.sbin/sendmail/src/version.c 3.21